*{
    margin: 0;
    padding: 0;
    box-sizing: border-box;
}
.box{
    width: 1500px;
    height: 840px;
    margin: auto;
    background-color: aliceblue;
}
.shang{
    background-color: white;
}
ul{
    display: flex;
}
ul li{
    list-style: none;
}
.zhong{
    width: 1300px;
    height: 350px;
    background-color: white;
    border-radius: 5px;
    margin: 10px auto;
    position: relative;
}
.zhong h3{
    margin-left: 20px;
    padding-top: 20px;
}
.yc{
    position: absolute;
    right: 10px;
    top: 10px;
    border: 2px solid red;
    border-radius: 10px;
    color: red;
    font-size: 15px;
}